How much heat energy (Joules) is required to raise the temperature of 1000.0 g water from 20 deg c to 50 deg c

Question

Please work it out??

Answer 1

It takes one calorie to raise the temperature of 1 gram of water by 1 deg C.

It would require 30,000 calories to raise 1000g of water by 30 deg C.

The conversion of calories to joules is: 1 cal = 4.184 J

Therefore: 30,000 cal x 4.184 = approx. 126 kJ

Answer 2

Delta T = 50-20 = 30°C

q = m c (delta T)

q = 1000.0 g (4.184 J/mol°C) (30°C)
q = 125520 J = 125 kJ